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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae4ea74e05b6c52b449b17ed4c11f3a0fc44f6c2785789c6a80698e1b76b6c2' 
  AND token = 'L51yc+R+TvevfHw2ocY+QkrRsEu9NOsXGgED7kjnRSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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