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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f092c2d727e0c4c69bddeeba389f44aee6346aa423f24b33f17990b2301ce200' 
  AND token = '83X9QOB8MqKMnSJgrfacCSqOnHBPos2pCcsA/chXDA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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