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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4ad3f96ac3f62842c6a5c9dad1ad616a3dac78e6349f2d869ea6411fbd0348' 
  AND token = '+I6D9l5CxaTe/gBYqeTz44xJ9IxvnxlfDcspjDbuL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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