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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf3445046a3e0726b54c925f7144acdd61663dd659997e5f03dc7b72f6fa3cb' 
  AND token = 'QXjsrtlVgiyS4eJuXmUeBrFI9jl4axjaWbEDDamq72E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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