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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcae9d55baf8113d45d325a44587ad507fda04a1d43ba0cc34e308241fff94e1' 
  AND token = 'VFmNhgUL8ap+mTdknZvrnDJZiZwiC+5lmAt065LPDyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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