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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f770689907af8643cd5ca205756190f0e853ee5d79ef95fdc4b8fe0698cd01a' 
  AND token = 'syzyEdFayFfwthFis28o0rw8r7xvi59oQ1AjS0Shtlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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