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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c3ad352e52b9f1d710244996028b2403633b836fb1530bf3040e8ac0484b21' 
  AND token = 'c/zP5jpJ2oouqaQvT6H6iU/Nt1piER41LAFJnqK1kJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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