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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42ea7b716b78aa42d2add117b001053e67327195801778430619cd6e1ce4a63' 
  AND token = 'Z8xV2iWGPtZA1jxltnXRctuf1lu4Lg65ZRg7y2Xm9yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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