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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b85820ec763ac9a841b51220fb67f7174b5e3b2d70c39c7b536ac03a93a973' 
  AND token = '3xxqSS3Y4ZfP8nKg41uB78w5Nny+QwT8Sq3lIWM7CZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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