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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba1ab99a2f3bfdac34d0c5409473047bba3d50b7fd504f377b251f94dd35b76' 
  AND token = '0X0t+Ch0UsqfYCEjRCJIi323li2FbJQyvmlWY18/CtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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