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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04e6dd633b53a6fb79808669548241c23a2d9d0f10bcbbf8993918a82139e13' 
  AND token = 'MOq0MQspwNaTxCHd3/VYFA1uLWkUVo2wK96LOFVQ3Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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