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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f641fa3f903702649615b2eaf303058667a4387a9ba15a1aab9f813c57c94971' 
  AND token = '4FamD5ob/Of/Z2tKh7kzDEBwKjF53JQfaIXJSP8XiAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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