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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ac8ce9064e536f4290208de6a84222c4c48b255328d01b1026fa4b15ff6bc8' 
  AND token = 'yqK9PxPq8kYKlUOLPusWa4teul6ljGiwazj8WqTrXfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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