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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc57ec0e31bf50c75636bc1f99d24536bab503d5fc50b693d2e9ef89865fbc4f' 
  AND token = 'z/BaXwB2WN9E6oCW7+wpXIwkSYODH2fr57iyUi1kcho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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