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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61583e152fcf6814b1683c2c7fd891b7cbb8175cbac15f4b084db7b2999d30b7' 
  AND token = '+juMoADE7b2CQSiLXnAUAMb5SlXD4NvBDv8vCAeVOBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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