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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162b80a42f04bc3c2bfccc389c96d7f1dfc447338fe9937832ad066d82ca73ee' 
  AND token = 'ozlS7wkyc/ZyruoLfvJAFV1t0+JAvpybwwWRmEvDf18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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