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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df51fc165a73ce6053df82c59f7dcb18fa707406af88b33f7e05747a82692b67' 
  AND token = 'OdWGF8BqeC7C6RczE7kzuxOxQQOiunNrvhze8fmqV2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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