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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2a9eac275d7669226b7baead0da9ec19f296a85b6553ed00cb8eed3de8e22a' 
  AND token = 'fc+n2hSwnp5LXRoJTQYEMehdsPPxAWG6zO2r4j9A7ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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