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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5339d861e33f396b5f4d11b34c18eeac7c15d29da979c80650abc0d4d0a87738' 
  AND token = 'BLjg3Aed+uiqThIcVs5R0d7A537+5rtmWWa8Or2DJlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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