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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699bc1d0d8bca0eba9c0bb3cbb2ea142eae7a009a5d88237ffe4504f3e735096' 
  AND token = 'KHJGCKUP5o+Mp5HAdjc+KIP4qYN3u+OsTy1EYJI7MOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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