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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9851aed9aa5bc3f4a6baa142a8dead0914bae922a10aa836021ab17c266dc6' 
  AND token = 'Bdo0rtORnMO7nQTbZnGDeghm0IOsM7zjTlIwsfdxmsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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