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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bf6fbda700495ce3a875459c58a5d676b54aa49ccf9f4dde9098898409290d' 
  AND token = 'Mdhv6VzYYvg+dyjxDlUhvPmq7ACOpzkVV3Arq9dVucw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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