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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bd3a75e9003c8f03582a2874d092a4d9a133e59c8cb8bea0a198c678bd272d' 
  AND token = 'K2nxwxro3oJfn7/whw5FfU7EInQS51IGjU9cq3fZiDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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