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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e715f243db673c3f518915a24f5c34158863532b436a6eaf221ba5b70e3204c' 
  AND token = 'JvxH0L8MHvfwXAnNKRduESFLE9xi5QvErH7/b3Ux5oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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