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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f400c86472be20c31cc17756ed51db3c210d4271c6c511f07c033000efab0a60' 
  AND token = '82Z6Wpi3ZAGAmyXu0sY9nISDUPoVbemTk5443bwy72w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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