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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f246dd44e8ca14b3d6de7f2612927a8d9b0fe9d8de75193d4809e73720ca69e' 
  AND token = '1UUldXbTUtqC/uRaETcxTIaM7NH14WGX9YRIfvEKMII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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