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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daea7502fb19bd5d2f13474fb6ef5b35402fe7f92d36c8c4a06c7f7178c3d0a9' 
  AND token = 'MMRnsGjG9tzScnd53VP4MfQN1xtZbeaej14bLm/II3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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