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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbda2a325fd901d1cf0f8594e56f3bb8a4142820890dc4768515c1a7d784ccd' 
  AND token = 'z1mNM5yt0aZzuaDKyindWDNbC6oasmLlo1Tk/d2/Go4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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