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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0b89572affd1f195700e07335eaea359803f5cc88ed1fa4116382059d285e8' 
  AND token = '5/xGUZ3rY1PREZogNy7qk1rNg9hLOsnN0tXjMUkKor4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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