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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063e220127d090df51056546565382b07f2aa88a368bb8d173c32b8d90b9978' 
  AND token = 'Pco6mmqawAn14aLRNptBJw5l4BRByjdhsHTFazxiiRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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