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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bec5ecba50dad07c84088a8199c3756efd35995c813796b2a4baaf2c9be7af' 
  AND token = '3rclLDuZAaAL58X3HTXOKo3N1X57/adzug9aq1xkqwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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