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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8df81dd57585b57cc29d11de97d64e6036797f8e67bc3c2196f7d179af400a' 
  AND token = 'SLqQb3ZtapfX33YrI1gENyJoWh770LAbBvz71Lra/FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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