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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd7d73971926e61174a348ad80530a3e80dcdb128626eeb828a27759d6d6326' 
  AND token = 'e4H1C4v0wnn9E4wh+Mll4J8cv2t4iGxqtWURseYlt3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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