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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f8498bfe5dd56134e228f3fa4de48cdb9cbad56de403647141a20c79705c14' 
  AND token = 'TCVUo8xTMCBwGi8Kps2JDalkWGIcUmo8e+QkzXAcv7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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