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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db82dc9c8e76ac2994c3a4979720cf65f4563781e92aa907adc70e4d55712719' 
  AND token = 'Cc7Att/qrkpXKTjEdLz/K0/TXkcdznMmvhPTmLO0DBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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