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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48cbdb285bbbb65f7d7d678625cfb44103ec2c2fca2ceb1e522e7b89e8eb494' 
  AND token = 'mF5zV31M4A4NZSAHkjQsGwX1c8I1mOWSQKFK0C54MEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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