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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a8a9aaf65d0ea92fbccb6abc655acfe639f183a6564f4fa761383d2b53b620' 
  AND token = 'rfCQbqhPKWjCdUmK9+KNh8WSyc7zkJ71ul3eNc6ZF5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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