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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bd4fe033bb8ec9a85d5c5b268d6bb60f78ee9ac74a2671a640f3ba88aac810' 
  AND token = 'rmStHoZuRBl6C9U0D8eci/yy3LBS9f4nF9+g95CbJkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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