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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc331847b0b170d38a1925d623272b72d97856bb9aa86834bd7eba1be798b925' 
  AND token = '2LQDFtSwEnBmpls2wsaFZCX7GCtZtRWj00yxVBTr6jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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