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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff554880b523a06d7f9c206c54d011644f145e00a7e2a4c5c386d35f8f2a726' 
  AND token = 'uaBnDhw1N3kghJ2JHOMgm3rnozspYu8JApANCmM7SNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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