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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7423fb39f3951f3acb0620c74f47f17411c031dc5aa5e85c8d867d3da34e6f6d' 
  AND token = '6gq83ggEn7ugo1nXvj+1EhxVtn2HObo0JaY9YbEW4Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}