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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a411a9de80f08b17df86dd00d7d6b8ed5afcf4351b81770d0d3bde4855a70a4c' 
  AND token = 'L8oREYvWXB3SmSDhTQEvz+fRSkk30RnSEy0mo0rnL1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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