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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6e0fb51e0c56c758e46710e10276b850de8e1e6a963c5b56481ef4c5725d41' 
  AND token = 'WUNvDN6V0QgTWH3R8K0I7AypBUcWJ2iEQ+uK7MshkAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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