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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30ae2c8703926ec8c7bf1d25cde1ccc028b3201989986158c3875bb6fbc0f76' 
  AND token = 'ghBgXpkmc40kYiK8zSz6ZbA2pURG6pju4my8jSJKTDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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