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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058f35ffd5b4f9e7d5e76f8558fa82b85d0e2e31ec260264a6ad6bc90dbc919c' 
  AND token = 'ciSrRqQn/r9NbDQ9eUicL5xcv2TGeEvxBnQ1tbjnAmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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