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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938793b5aae76a8995f89ca08d8d9eac692d4f31f7b605af8eec628a365e7415' 
  AND token = 'KvICcqvI1TZ6BWdQ43erepg3adHVcE/r8Yjb/AYQ0YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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