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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c245fe3924d282198b5ed666a18768e920419c420a8456a665fcb17ae0243980' 
  AND token = 'QWjKPE7dc8+3zlMluPww5YITRzy8ot4Tq+X8jkzq3N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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