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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c305c814b5f596ee5e39b7e9e04ece5f1002e8ffd29cec5d4a7f2e90a0861e23' 
  AND token = 'eJoBqAJcH5cW4CvlzQnMflYquKroD1nJPSuQy/C/cBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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