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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b0151aeed98ea81e1af6b772cd17080878a3cb11ff81b96f35e503f60f908f' 
  AND token = 'myMOrG9bMlj/nOd7XlUbMo5gAGrnTz9tzwJjeKosrjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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