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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a72e53e96dc71da3de2466518674c93fa84efceb8b7c5c83a4b472dfed28b5' 
  AND token = 'aj/iHEzLPbGQRrbDpwXRktQ0hLHTB5/Zc5jWIC3qSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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