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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40c314373b1b5bd20a835c1c535c6de50049270890f54be382a8c60d23f2ef9' 
  AND token = 'QeO9pjm3Hb2CdzfsDtXBBymFUabmu2WR0cYRVBRddKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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