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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4159ec4069e8487e687cdcdc93e0db72cd77ab869a402a68c2b67b2d06a798c' 
  AND token = 'yjASCyKpiQjjR7iTEgJlxkkKo55BIfY8vZ06TcdXBTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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