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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec892ff7963948128f9e85a80d461260630264717fa7f1eb23b7a7ba7071571' 
  AND token = 'TauyJkP4fyoI5PGL9ClWIh9nWs9wbM7PrIeO1d9tbEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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