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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f5413f723c8fcfbc99583962ef99140d0a4998e59e77e47e0641edb9acdcbe' 
  AND token = '92d58i6ZpPHpRqJKVn4PeEL8FxIWTlBl1ZAvxY81r3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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