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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84205abba8a5f44c8ec41e29d2c2bce7fc5ce3e7ecf9ddb98cc584e94c5144b0' 
  AND token = 'bA/spiR38A6PRbMapkYIUHHy7hHuqMiFNqSZUqjRt9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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