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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3983e0cee886e736dd56d26598f5186cbc1c5fa78e39b662b60207f5ae3da2' 
  AND token = 'KdlhxJtYOEiKGDx8mK29Sleym9ZMKIQmt5b7oquH+dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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