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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7c67bff46b9c75325486c31b18a15bae30bed846b16178ef64100da7f55ba6' 
  AND token = 'MbWvyFG4i4RYHk610hvx65Q1c5IRXBbqEaiCjcWWKnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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