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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd953bf449605e432adf9ea92d1a7386c89252d43afe9644efed1ed1d68d00de5' 
  AND token = 'XBsWtojpiFwpvagKKfuDnXub2X5tWs39OF+1HxsNVNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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