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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb9ba6428a5af2976816703aa23400f84316cb2c1702e5953ceb9efd93c7702' 
  AND token = 'a7DY2bBZ23MRhLXuM31Aorq7tCyzCZOZrtBP25XVZXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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