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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe680b0a2d2e5822ac40f961317d53c662c880b49cc8e33c458162e652c0e81' 
  AND token = 'ftXlToBPxO0O98SZ8tYcI8O+XJbKllbhncaqR5X3dVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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