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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078f6509eea248dc3c9cbc2fedece4ef3a7b655c8a57a57503e18876718685b0' 
  AND token = 'xOaVRzfuLK7Zsx6VnPPxt95X5mOCZEjd/yix73TTfsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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