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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15b4008d30079e64e68a09b040e77dfcba925fdf4f1d54926434601a019690c' 
  AND token = 'DGeNb23at0sweQ0C9YKVHJNHHBWQKd/QRfTPoXHoFKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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