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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c88888fd5f2f0d0de5ce63972b9eb7d7dc8c7227a82b68c99ced0d5acfc2a4' 
  AND token = 'RFj8e8OKmBQwNoyeqodldL3Cya6S5HzP/FnLwmyOgdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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