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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30048b639a9f4cbfd787d7c12ae2c3852e34855d3f978ae0436e80a3288f853' 
  AND token = 'mP8zmHhdNon08cY66L+O8EdTxkuhVBJ0cu5TBVPzvEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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