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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e7e5e61cc559095e0a68203757aa7819b41de7424338e788fa10124d6aac28' 
  AND token = 'X+wf6Q8trejiEKwdU5DgvZidIZlNnbSiwQllMhNeKs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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